@inject ToastService ToastService
<Message Color="Color.Info">
    date : @date
</Message>
<Calendar @bind-Value="date" OnValueChanged="Change" DayHeight="40px"></Calendar>

@code{

    DateTime date = DateTime.Now.AddDays(2);

    void Change(CalendarDay day)
    {
        var msg = day.Date.ToString("yyyy-MM-dd") + " " + day.Lunar.MonthName + day.Lunar.DayName;
        ToastService.Show(msg);
    }
}